[en] Tungsten Inert Gas (TIG) welding is the most common practice in aluminum alloys. It is necessary to devise a fail-safe design against fatigue failure of welded structures. Under the presence of cyclic load fatigue life is usually predicted by endurance limit of working material. In this research paper a comprehensive effort is made to investigate the endurance limit of aluminum alloy AA2219-T87. A four point rotating and bending fatigue testing machine is used to test the fatigue life estimation of the said alloy. Results obtained through experimentations are verified through numerical simulation by using software package ANSYS Workbench 14. 0. A brief microstructural study is also performed using metallurgical microscope. A gigantic contrast in grain structure is observed in different zones, formed due to TIG welding. Variation in material strength due to grains shifting from unwelded base metal (BM) to weld nugget zone (WZN) is studied in this research. (author)